The Florida Outdoor Choice
Conquer the Florida Climate: Why Builders Specify Treated Parallam® Plus PSL for Heavy-Duty Outdoor Spans

If you are building outdoor living spaces in Florida—whether a multi-story covered deck, a cantilevered balcony, or an open-air pool pavilion—you face a constant battle against the elements. Standard lumber simply isn't built to withstand Florida's relentless humidity, intense UV rays, and voracious termites over long spans. Over time, typical treated timber can warp, twist, and sag, creating structural and cosmetic issues.
To solve this, custom builders, architects, and structural engineers in Tampa Bay specify the gold standard in exterior engineered wood: Treated Parallam® Plus PSL (Parallel Strand Lumber) from Weyerhaeuser.
What Makes Treated Parallam Plus PSL Different?
Traditional dimensional lumber is pressure-treated primarily on the outer shell, leaving the interior vulnerable to rot and pests if the wood is cut, drilled, or notched. Parallam Plus PSL solves this by utilizing an innovative manufacturing process.
During production, long, thin strands of wood are coated with a waterproof adhesive and pressurized with Wolmanized® preservative treatment directly into the core before being compressed into solid, deep beams and columns.
- Treatment to the Core: Cut, drill, and notch with confidence—no on-site field treatment is required, as the preservative penetrates entirely through the material.
- Massive Load Capacity & Long Spans: Carry heavy outdoor structural loads over distances where typical wood would sag, eliminating the need for intrusive intermediate support posts.
- Unmatched Dimensional Stability: Because the parallel strands are tightly bonded and kiln-dried after treatment, these beams resist the twisting, cupping, and bowing common in traditional lumber exposed to Florida's heat and moisture.
Where Should You Use It?
Treated Parallam Plus PSL is designed for structural applications that demand extreme load capacity in exposed, damp, or ground-contact environments, such as:
- Multi-level covered porches and balconies
- Large outdoor kitchens and pavilions
- Structural posts for coastal elevated homes
- Retaining walls, pedestrian bridges, and heavy-duty carports
Large-Scale Staging on Your Job Site
Because these massive beams and columns are exceptionally heavy, getting them onto your site requires specialized equipment. That's where North Rome Lumber's fleet comes in. We offer on-site staging of framing packages upon request, utilizing our 48-foot flatbed with an onboard Moffett (transportable forklift) to navigate rough terrain and place your Treated Parallam directly at your build perimeter—saving your crew hours of manual labor.
Tackle your next outdoor build with the ultimate in exterior structural engineering.











